A woman carries her child on her hip in front of the First Baptist Church polling station in Maricopa, Ariz., before casting her vote on Super Tuesday, the U.S. presidential election's biggest primary day.

A woman carries her child on her hip in front of the First Baptist Church polling station in Maricopa, Ariz., before casting her vote on Super Tuesday, the U.S. presidential election's biggest primary day. (Win McNamee / Getty Images)